Nikon KEYMISSION 170 Reference Manual page 48

2
Turn the lens protector clockwise to secure it.
Turn the lens protector until its mark and the mark on the top of the camera (S) are
aligned.
To attach the underwater lens protector, press it against the camera while turning.
B
Notes About Checking the Attached Lens Protector
Make sure that the lens protector is securely attached.
Removing the Lens Protector or Underwater Lens Protector
1
Turn the lens protector counterclockwise.
2
Pull the lens protector toward you to remove it.
Using the Camera
Using Accessories
29